Lin Mu, a modern infrastructure project manager, was reborn in the Qin Dynasty and became a humble craftsman. With engineering thinking and standardization concepts that transcended the times, he emerged in the Longxi workshop, accidentally came into contact with the secrets of the "black iron beyond the sky", and even broke into the First Emperor's vision of escaping his fate.
From the battlefield that swept across Liuhe to the imperial court that unified the empire, Lin Mu used technology as his blade and worked with Mohist descendants to build a bridge between ancient and modern crafts and win the trust of famous generals. However, he also faced the obstruction of conservative forces, the suspicion of powerful officials, and the prying eyes of conspiracy. He promoted production and institutional innovation, accompanied Fusu's growth, and cultivated the fire of innovation. He not only built a solid foundation for the empire and healed the rift in unification, but also uncovered the secrets of Black Iron, rewrote the fate of the Second Emperor of the Qin Dynasty, and illuminated the dawn of Chinese civilization breaking away from reincarnation and moving towards sustainability.